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    <title>Sentinel Toolbox Help - The Layer Manager Window</title>
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<body>
<table class="header">
    <tr class="header">
        <td class="header">&nbsp;
            The Layer Manager Window
        </td>

        <td class="header" align="right"><a href="../general/overview/SnapOverview.html"><img src="../images/snap_header.jpg"
                                                                                     border="0"/></a></td>
    </tr>
</table>

<h3>Overview</h3>

<p>The layer manager is used to control what content is shown in the current
    <a href="ProductSceneView.html">Image View</a> and how it is displayed.
</p>

<p> You can open the layer manager tool window from the <b>View / Tool Windows / Layer Manager</b>
    menu or by clicking the <img src="images/icons/LayerManager24.png"/> icon in the tool bar.
    A layer can be shown or hidden by using the check box left to the layer name.
    Finer visibility control can be achieved by selecting a layer and using the <b>Transparency</b>
    slider. Visibility changes will directly take effect in the Image View.
    It is possible to <b>Swipe</b> or slide the layers over the image.
</p>

<div align="center">
    <table border="0">
        <tr align="center">
            <td><img src="images/Layer_manager.png" border="0" width="600" height="500"/></td>
        </tr>
        <tr align="center">
            <td>Layer manager tool window</td>
        </tr>
    </table>
</div>


<h3>Functions</h3>

<p>
    <img src="images/icons/Plus24.gif"/> <b>Add layer:</b> Opens the <a href="#layerEditors">Add Layer</a>
    assistant window which lets you add a new layer to the current view.
</p>

<p>
    <img src="images/icons/Minus24.gif"> <b>Remove layer:</b> Removes the selected layer.
    Note that not all layers can be removed.
</p>

<p>
    <img src="images/icons/LayerEditor24.png"> <b>Edit layer:</b> Opens the <a href="#layerEditors">Layer Editor</a>
    tool window which lets you alter the display properties of the selected layer.
</p>

<p>
    <img src="images/icons/Up24.gif"> <b>Move up:</b> Moves the selected layer up so that it is displayed on top
    of all layers following it in the list.
</p>

<p>
    <img src="images/icons/Down24.gif"> <b>Move down:</b> Moves the selected layer down so that it is displayed
    underneath of all overlying layers in the list.
</p>

<p>
    <img src="images/icons/Left24.gif"> <b>Move left:</b> Moves the layer into the parent group (if any).
</p>

<p>
    <img src="images/icons/Right24.gif"> <b>Move down:</b> Moves the layer into a child group (if any).
</p>

<a name="layerEditors"><h3>Layer Editor</h3></a>

<p>Layer editors let you alter layer properties in order to control the display of layer data.
    Different layer types have different layer editors. The following screen-shot shows the layer editor
    of the geometry layer:</p>

<div align="center">
    <table border="0">
        <tr align="center">
            <td><img src="images/LayerManagerLayerEditor.png" border="0"/></td>
        </tr>
        <tr align="center">
            <td>Layer editor tool window</td>
        </tr>
    </table>
</div>

<p>Changes to the properties in this window are directly propagated to the layer selected in the layer manager and
    display updates will occur immediately in the current Image View.</p>

<a name="addingLayers"><h3>Adding Layers</h3></a>

<p>
    The <b>Add Layer</b> assistant window shows a number of <i>layer sources</i>. It depends on
    the type of the current <a href="ProductSceneView.html">Image View</a> which layer sources are
    present in this list. The following <!-- (BEAM 4.6) --> standard layers are always usable:
</p>
<ul>
    <li><b>ESRI Shapefile</b> - Overlays an ESRI shapefile read from a file.</li>
    <li><b>Image from File</b> - Overlays any image read from a file.</li>
    <li><b>Image of Band / Tie-Point Grid</b> - Overlays images of bands or tie-point grids of other
        products currently opened in the Sentinel Toolbox.
    </li>
    <li><b>Layer Group</b> - Creates a group in which you can freely organise other layers and groups.</li>
</ul>

<p>
    Layer sources which are restricted to special image views <!-- (BEAM 4.6) --> are:
</p>
<ul>
    <li><b>Image from Web Map Service (WMS)</b> - Downloads a thematic image map layer from a dedicated internet WMS.
        Applicable to map-projected (geo-referenced) views only. A good list of public services is provided at
        <object classid="java:org.netbeans.modules.javahelp.BrowserDisplayer">     
            <param name="content" value="http://www.skylab-mobilesystems.com/en/wms_serverlist.html">
            <param name="text" value="<html><u>http://www.skylab-mobilesystems.com/en/wms_serverlist.html</u></html>">
        </object>.
    </li>
    <li><b>Wind Speed from MERIS ECMWF annotation data</b> - Displays wind speed vectors. Applicable to MERIS L1b/L2
        band views only.
    </li>
</ul>


<div align="center">
    <table border="0">
        <tr align="center">
            <td><img src="images/LayerManagerAddLayer.png" border="0"/></td>
        </tr>
        <tr align="center">
            <td>The 'Add Layer' dialog</td>
        </tr>
    </table>
</div>

<p>
    Select a layer source and press <b>&gt; Next</b>. Depending on the type of layer selected,
    the assistant window will guide you through one or more option pages. Once the <b>Finish</b> button is
    enabled, you can add the new layer to the current <a href="ProductSceneView.html">Image View</a>.
</p>

<!--<div align="center">
    <table border="0">
        <tr align="center">
            <td><img src="images/LayerManagerShapefile.png" border="0"/></td>
        </tr>
        <tr align="center">
            <td>Layer manager tool view after adding an ESRI shapefile layer</td>
        </tr>
    </table>
</div>-->

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